The origin of ferromagnetism in Fe-57-doped NiO
| dc.contributor.author | Douvalis, A. P. | en |
| dc.contributor.author | Jankovic, L. | en |
| dc.contributor.author | Bakas, T. | en |
| dc.date.accessioned | 2015-11-24T18:31:53Z | |
| dc.date.available | 2015-11-24T18:31:53Z | |
| dc.identifier.issn | 0953-8984 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/16516 | |
| dc.rights | Default Licence | - |
| dc.subject | room-temperature ferromagnetism | en |
| dc.subject | magnetic-properties | en |
| dc.subject | mossbauer-spectra | en |
| dc.subject | nanocrystalline nife2o4 | en |
| dc.subject | ferrite nanoparticles | en |
| dc.subject | nickel ferrite | en |
| dc.subject | thin-films | en |
| dc.subject | band-gap | en |
| dc.subject | semiconductors | en |
| dc.subject | spintronics | en |
| dc.title | The origin of ferromagnetism in Fe-57-doped NiO | en |
| heal.abstract | The origin of ferromagnetism observed in 2 at.% Fe-57-doped NiO samples is investigated. A precursor was produced from the co-precipitation of stoichiometric Fe-57 and Ni nitrate solutions, and the 2% Fe-57-doped NiO samples were prepared by heating this precursor in air at temperatures between 673 and 873 K, for 1-25 h. X-ray diffraction, scanning electron microscopy, magnetization measurements and Fe-57 Mossbauer spectroscopy were used to study the properties of the prepared compounds. The samples are composed of crystalline nanoparticles with average sizes between 9 and 29 nm, depending on the heating conditions. Magnetization measurements show the appearance of room-temperature ferromagnetism for samples heated both at 673 and 873 K. The Fe-57 Mossbauer spectroscopy results indicate that this ferromagnetism is related to (NiFe2O4)-Fe-57 ferrimagnetic impurities for the samples heated at 873 K and to finite-size effects for the samples heated at 673 K. The Ni57Fe2O4 impurities interact magnetically with the antiferromagnetic Fe-57-doped NiO matrix and it is proposed that they result from a diffusion-type process of Fe-57(3+) ions during the heat treatment of the precursor. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.primary | Doi 10.1088/0953-8984/19/43/436203 | - |
| heal.identifier.secondary | <Go to ISI>://000250146700006 | - |
| heal.identifier.secondary | http://iopscience.iop.org/0953-8984/19/43/436203/pdf/0953-8984_19_43_436203.pdf | - |
| heal.journalName | Journal of Physics-Condensed Matter | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 2007 | - |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών | el |
| heal.type | journalArticle | - |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.type.en | Journal article | en |
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